Tautology definition

Tautology

Topics Tautology Definition

WordNet

(1) Useless repetition

"To say that something is `adequate enough' is a tautology"

(2) (logic) a statement that is necessarily true

"The statement `he is brave or he is not brave' is a tautology"

WiktionaryText

redundant use of words

It is tautology to say, "Forward Planning".
An expression that features tautology.
A statement that is true for all values of its variables

Given a Boolean A, "A OR (NOT A)" is a tautology.